Vanja Udovicic, born September 12, 1982 in Belgrade, Serbia, Yugoslavia, is a Serbian water polo player.

Since 2007, Udovicic's been playing defense for Italian club Pro Recco where he arrived after playing two seasons for Circolo Nautico Posillipo from Naples. He started his career in water polo club Partizan from Belgrade and then moved on to VK Jadran from Herceg Novi.

In June 2010, Pro Recco club leadership served Udovicic with an ultimatum in an effort to force him to switch his national team allegiance and start playing for the Italian national team. He refused, choosing to continue playing for the Serbian national team. As a result, Pro Recco terminated his contract. His decision to remain loyal to his country resulted in a wave of positive reaction in the Serbian press, while Serbian Water Polo Association president publicly thanked Udovicic for refusing to cave into the Italian pressure.

With Serbian national team, Udovicic has won gold on World Championship in 2009, 2005, European gold in 2003 and 2006, European gold for juniors in 2000 and Olympic silver in 2004.